Active hybrid circuit for a full duplex channel

Abstract

An active hybrid circuit for a full duplex channel generates a duplicated voltage at the current output stage to reduce the energy of the transmitter transmitted to the receiver. The active hybrid circuit cancels the energy of the transmitter transmitted to the receiver when it is operated in a full duplex channel with high-speed transmission. The active hybrid circuit for full a duplex channel comprises a transmit digital-to-analog converter for generating an analog transmit signal, a receive analog-to-digital converter for receiving an analog receive signal, a duplicated voltage digital-to-analog converter for generating a corresponding duplicated voltage according to the analog transmit signal of the transmit digital-to-analog converter, and a plurality of signal combiners for subtracting the duplicated voltage from the analog transmit signal to cancel the influence of analog transmit signal to the analog receive signal.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an active hybrid circuit for use in a full duplex channel. In particular, this invention provides an active hybrid circuit to generate a duplicated voltage of a current output stage for reducing the energy of the transmitter echoing to the receiver when the hybrid circuit is operated in a full duplex channel.[0003]2. Description of the Related Art[0004]Due to the demand for information communication, such as the transmission of data, sound, and video, the data transmission rate has improved continually as the hardware and communication protocol have progressed to achieve high-speed and real time transmission. Information transmission and business transactions over the Internet have increased as personal computers, workstations and servers become more and more popular. For Ethernet, the transmission rate has also improved from the early original 10 Mbps of the IEEE 802.3 10BASE-T standard...

AI Technical Summary

Benefits of technology

[0011]The main object of the present invention is to provide an active hybrid circuit for a full duplex channel. This invention generates a duplicated voltage at a current output stage to reduce the energy of the transmitted signal at the receiver when it is operating in a full duplex channel. The energy of the transmitter transmitted to the receiver affects the error rate of the data transmission and the transmitter range. The active hybrid circuit of the present invention solves the above-identified problems.

[0012]Another aspect of the present invention is to provide an active hybrid circuit for a full duplex channel. The active hybrid circuit comprises an adjustable circuit. Because transformers are not perfect, transformers often boost high frequency signals. The active hybrid circuit with an adjustable circuit overcomes the difference between transformers and reduces the overshoot of high frequency signals.

[0013]In order to achieve the above objects, the present invention provides an active hybrid circuit for use in a full duplex channel. The active hybrid circuit comprises a transmit digital-to-analog converter (DAC) having a positive output port and a negative output port for generating an analog transmit signal, a receive analog-to-digital converter (ADC) having a positive input port and a negative input port for receiving an analog receive signal, the positive input port and the negative input port of the receive analog-to-digital converter being electrically connected to the corresponding positive output port and the negative output port of the transmit digital-to-analog converter, a duplicated voltage digital-to-analog converter having a positive output port and a negative output port for generating a corresponding duplicated voltage according to the analog transmit signal of the transmit digital-to-analog converter, the positive output port and the negative output port of the duplicated voltage digital-to-analog converter being electrically connected to the corresponding positive output port and negative output port of the transmit digital-to-analog converter, and a plurality of signal combiners electrically connected to the corresponding positive output / input port and negative output / input port of the transmit digital-to-analog converter, the receive analog-to-digital converter and the duplicated voltage digital-to-analog converter for subtracting the duplicated voltage from the analog transmit signal to eliminate the influence of the analog transmit signal on the analog receive signal.

[0014]The present invention also provides a method for processing signals by an active hybrid circuit for a full duplex channel. The method comprises: generating a transmit signal by a transmitter having a current output driver; generating a duplicated voltage that is generated according to the corresponding output drive current of the transmit signal through a load resistor of the transmission line; combining the duplicated voltage and the transmit signal to cancel the echo signal of the receiver that comes from the transmit signal of the transmitter; amplifying the receive signal without the echo signal to increase the resolution; and converting the receive signal via an analog-to-digital converter.

Problems solved by technology

Because transformers are not perfect, transformers often boost high frequency signals.

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